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          JS 实现轮播图（附jQuery版本）
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        <h3 id="实现效果"><a href="#实现效果" class="headerlink" title="实现效果"></a>实现效果</h3><ul>
<li>多张图片自动轮播展示，对应分页器（小圆点）高亮显示</li>
<li>点击分页器（小圆点）切换对应图片</li>
<li>点击前进/后退按钮切换当前图片的前一张/后一张图片</li>
<li>图片无缝切换，第一张图片和最后一张图片无缝切换</li>
<li>鼠标滑入停止图片切换，鼠标移出开始图片切换</li>
<li>前进后退按钮防抖</li>
</ul>
<a id="more"></a>

<p><img data-src="https://img-blog.csdnimg.cn/20201219104627257.gif" alt="轮播图切换"></p>
<h3 id="index-html（html-css）"><a href="#index-html（html-css）" class="headerlink" title="index.html（html+css）"></a>index.html（html+css）</h3><ul>
<li>创建 <code>index.html</code> 文件，粘贴如下代码</li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span 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class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">name</span>=<span class="string">&quot;viewport&quot;</span> <span class="attr">content</span>=<span class="string">&quot;width=device-width, initial-scale=1.0&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>轮播图<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span>&gt;</span></span><br><span class="line">        * &#123;</span><br><span class="line">            margin: 0;</span><br><span class="line">            padding: 0;</span><br><span class="line">        &#125;</span><br><span class="line">        ul &#123;</span><br><span class="line">            list-style: none;</span><br><span class="line">        &#125;</span><br><span class="line">        a &#123;</span><br><span class="line">            text-decoration: none;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-id">#banner</span> &#123;</span></span><br><span class="line">            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class="line"><span class="css">        <span class="selector-id">#wrapper</span> <span class="selector-tag">li</span> <span class="selector-tag">img</span> &#123;</span></span><br><span class="line">            display: block;</span><br><span class="line">            width: 100%;</span><br><span class="line">            height: 100%;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-id">#list</span> &#123;</span></span><br><span class="line">            position: absolute;</span><br><span class="line">            left: 50%;</span><br><span class="line">            display: flex;</span><br><span class="line">            align-items: center;</span><br><span class="line">            transform: translate(-50%, -50%);</span><br><span class="line">            bottom: 10px;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-id">#list</span> <span 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class="selector-tag">background</span>: <span class="selector-tag">url</span>(&quot;<span class="selector-tag">https</span>://<span class="selector-tag">i1</span><span class="selector-class">.mifile</span><span class="selector-class">.cn</span>/<span class="selector-tag">f</span>/<span class="selector-tag">i</span>/2014/<span class="selector-tag">cn</span>/<span class="selector-tag">icon</span>/<span class="selector-tag">icon-slides</span><span class="selector-class">.png</span>&quot;) <span class="selector-tag">no-repeat</span>;</span></span><br><span class="line">            width: 41px;</span><br><span class="line">            height: 69px;</span><br><span class="line">            position: absolute;</span><br><span class="line">            top: 50%;</span><br><span class="line">            transform: translate(0, -50%);</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-id">#left</span> &#123;</span></span><br><span class="line">            left: 0;</span><br><span class="line">            background-position: -84px 0;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-id">#right</span> &#123;</span></span><br><span class="line">            right: 0;</span><br><span class="line">            background-position: -125px 0;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-id">#left</span><span class="selector-pseudo">:hover</span> &#123;</span></span><br><span class="line">            background-position: 0 0;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-id">#right</span><span class="selector-pseudo">:hover</span> &#123;</span></span><br><span class="line">            background-position: -42px 0;</span><br><span class="line">        &#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">&quot;banner&quot;</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 图片 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">ul</span> <span class="attr">id</span>=<span class="string">&quot;wrapper&quot;</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">li</span>&gt;</span><span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">&quot;https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/9ebff5f5c1f52f2dbdd611897adbefd4.jpg?thumb=1&amp;w=1226&amp;h=460&amp;f=webp&amp;q=90&quot;</span> <span class="attr">alt</span>=<span class="string">&quot;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">li</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">ul</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 分页器（小圆点） --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">ul</span> <span class="attr">id</span>=<span class="string">&quot;list&quot;</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">li</span> <span class="attr">class</span>=<span class="string">&quot;active&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">li</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">ul</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 前进按钮 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:;&quot;</span> <span class="attr">id</span>=<span class="string">&quot;left&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 后退按钮 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:;&quot;</span> <span class="attr">id</span>=<span class="string">&quot;right&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">&quot;index.js&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>不加 JS，静态界面应该是下图这样的</p>
<ul>
<li>如果图片没有请求到，可以换一个图片链接</li>
</ul>
<p><img data-src="https://gitee.com/lilyn/pic/raw/master/js-img/%E8%BD%AE%E6%92%AD%E5%9B%BE-mi-%E9%9D%99%E6%80%81%E7%95%8C%E9%9D%A2.jpg" alt="轮播图-mi-静态界面"></p>
<h3 id="banner-json"><a href="#banner-json" class="headerlink" title="banner.json"></a>banner.json</h3><ul>
<li>这里需要用 Ajax 请求一下如下 json 数据</li>
<li>创建 <code>banner.json</code> ，粘贴如下数据</li>
</ul>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line">[</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="attr">&quot;id&quot;</span>: <span class="number">1</span>,</span><br><span class="line">        <span class="attr">&quot;img&quot;</span>: <span class="string">&quot;https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/9ebff5f5c1f52f2dbdd611897adbefd4.jpg?thumb=1&amp;w=1226&amp;h=460&amp;f=webp&amp;q=90&quot;</span>,</span><br><span class="line">        <span class="attr">&quot;desc&quot;</span>: <span class="string">&quot;banner1&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="attr">&quot;id&quot;</span>: <span class="number">2</span>,</span><br><span class="line">        <span class="attr">&quot;img&quot;</span>: <span class="string">&quot;https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/0ef4160c861b998239bce9adb82341e7.jpg?thumb=1&amp;w=1226&amp;h=460&amp;f=webp&amp;q=90&quot;</span>,</span><br><span class="line">        <span class="attr">&quot;desc&quot;</span>: <span class="string">&quot;banner2&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="attr">&quot;id&quot;</span>: <span class="number">3</span>,</span><br><span class="line">        <span class="attr">&quot;img&quot;</span>: <span class="string">&quot;https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/0e4acf11840c1d9600c34c46ffa73ec8.jpg?thumb=1&amp;w=1226&amp;h=460&amp;f=webp&amp;q=90&quot;</span>,</span><br><span class="line">        <span class="attr">&quot;desc&quot;</span>: <span class="string">&quot;banner3&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="attr">&quot;id&quot;</span>: <span class="number">4</span>,</span><br><span class="line">        <span class="attr">&quot;img&quot;</span>: <span class="string">&quot;https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/d65e7bc110ca74b9d7fa7ce53a841971.jpg?w=2452&amp;h=920&quot;</span>,</span><br><span class="line">        <span class="attr">&quot;desc&quot;</span>: <span class="string">&quot;banner4&quot;</span></span><br><span class="line">    &#125;</span><br><span class="line">]</span><br></pre></td></tr></table></figure>

<h3 id="index-js-（原生jS-）"><a href="#index-js-（原生jS-）" class="headerlink" title="index.js （原生jS ）"></a>index.js （原生jS ）</h3><ul>
<li>原理：图片平铺在一行，然后利用定时器计算偏移量实现定时轮播</li>
<li>切换动画效果函数可以使用正则把有效数组匹配出来 <code>/[+-]?(0|([1-9]\d+))(\.\d+)?/g</code> 或 把单位匹配出来 <code>/[^+-.\d]+/g</code>（还不太完善）</li>
<li><strong>注意：</strong>需要使用 live-server 启动</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 获取页面元素</span></span><br><span class="line"><span class="keyword">let</span> banner = <span class="built_in">document</span>.getElementById(<span class="string">&quot;banner&quot;</span>);</span><br><span class="line"><span class="keyword">let</span> wrapper = <span class="built_in">document</span>.getElementById(<span class="string">&quot;wrapper&quot;</span>);</span><br><span class="line"><span class="keyword">let</span> list = <span class="built_in">document</span>.getElementById(<span class="string">&quot;list&quot;</span>);</span><br><span class="line"><span class="keyword">let</span> lis = list.getElementsByTagName(<span class="string">&quot;li&quot;</span>);</span><br><span class="line"><span class="comment">// Ajax 请求数据</span></span><br><span class="line"><span class="keyword">let</span> data = <span class="literal">null</span>;</span><br><span class="line"><span class="comment">// 接收定时器的返回值</span></span><br><span class="line"><span class="keyword">let</span> timer = <span class="literal">null</span>;</span><br><span class="line"><span class="comment">// 当前展示图片的索引</span></span><br><span class="line"><span class="keyword">let</span> step = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 0.切换动画效果（简单实现jQuery animate切换效果）</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">animate</span>(<span class="params">ele, target, duration</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> begin = &#123;&#125;</span><br><span class="line">    <span class="keyword">let</span> change = &#123;&#125;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">const</span> key <span class="keyword">in</span> target) &#123;</span><br><span class="line">        begin[key] = <span class="built_in">parseFloat</span>(<span class="built_in">window</span>.getComputedStyle(ele)[key])</span><br><span class="line">        change[key] = target[key] - begin[key]</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">let</span> time = <span class="number">0</span></span><br><span class="line">    <span class="keyword">let</span> timers = <span class="built_in">setInterval</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">        time += <span class="number">20</span></span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">const</span> key <span class="keyword">in</span> target) &#123;</span><br><span class="line">            ele.style[key] = time / duration * change[key] + begin[key] + <span class="string">&quot;px&quot;</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> (time &gt;= duration) &#123;</span><br><span class="line">            <span class="built_in">clearInterval</span>(timers);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;, <span class="number">20</span>)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 1.数据请求 Ajax四部曲</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">getData</span>(<span class="params">url</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> xhr = <span class="keyword">new</span> XMLHttpRequest();</span><br><span class="line">    xhr.open(<span class="string">&quot;get&quot;</span>, url, <span class="literal">false</span>);</span><br><span class="line">    xhr.onreadystatechange = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (xhr.readyState === <span class="number">4</span> &amp;&amp; xhr.status === <span class="number">200</span>) &#123;</span><br><span class="line">            data = <span class="built_in">JSON</span>.parse(xhr.responseText);</span><br><span class="line">            renderHtml(data);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">    xhr.send();</span><br><span class="line">&#125;</span><br><span class="line">getData(<span class="string">&quot;./banner.json&quot;</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 2.渲染图片</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">renderHtml</span>(<span class="params">data</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> imgs = <span class="string">&quot;&quot;</span>;</span><br><span class="line">    <span class="keyword">let</span> lis = <span class="string">&quot;&quot;</span>;</span><br><span class="line">    data.forEach(<span class="function">(<span class="params">item, index</span>) =&gt;</span> &#123;</span><br><span class="line">        imgs += <span class="string">`&lt;li&gt;&lt;img src=&quot;<span class="subst">$&#123;item.img&#125;</span>&quot; alt=&quot;&quot;&gt;&lt;/li&gt;`</span>;</span><br><span class="line">        lis += <span class="string">&quot;&lt;li&gt;&lt;/li&gt;&quot;</span>;</span><br><span class="line">    &#125;);</span><br><span class="line">    <span class="comment">// 要实现无缝滚动，需要克隆第一张图片，放到最后一张的后面</span></span><br><span class="line">    imgs += <span class="string">`&lt;li&gt;&lt;img src=&quot;<span class="subst">$&#123;data[<span class="number">0</span>].img&#125;</span>&quot; alt=&quot;&quot;&gt;&lt;/li&gt;`</span>;</span><br><span class="line">    wrapper.innerHTML = imgs;</span><br><span class="line">    list.innerHTML = lis;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 3.实现自动轮播，每隔2000ms执行一次</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">autoMove</span>(<span class="params">index</span>) </span>&#123;</span><br><span class="line">    <span class="comment">// 图片索引自增（切换下一张图片）</span></span><br><span class="line">    step++;</span><br><span class="line">    <span class="comment">// 如果当前函数执行时没有传形参index，那就什么都不做，如果形参index有值，就把index赋值给step即可</span></span><br><span class="line">    <span class="keyword">typeof</span> index == <span class="string">&quot;undefined&quot;</span> ? <span class="literal">null</span> : step = index;</span><br><span class="line">    <span class="comment">// 如果当前的step&gt;=5说明已经运动到最后一张图片了，这时候需要马上把wrapper的left值改为0</span></span><br><span class="line">    <span class="keyword">if</span> (step &gt;= data.length + <span class="number">1</span>) &#123;</span><br><span class="line">        wrapper.style.left = <span class="number">0</span>;</span><br><span class="line">        <span class="comment">// 这时step改为1，可以正常显示第二张</span></span><br><span class="line">        step = <span class="number">1</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    animate(wrapper, &#123;</span><br><span class="line">        left: -<span class="number">1226</span> * step</span><br><span class="line">    &#125;, <span class="number">500</span>);</span><br><span class="line">    changeFocus();</span><br><span class="line">&#125;</span><br><span class="line">timer = <span class="built_in">setInterval</span>(autoMove, <span class="number">2000</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 4.鼠标划上图片停止轮播 鼠标离开继续轮播</span></span><br><span class="line">banner.onmouseover = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">    <span class="built_in">clearInterval</span>(timer);</span><br><span class="line">&#125;</span><br><span class="line">banner.onmouseout = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">    <span class="built_in">clearInterval</span>(timer);</span><br><span class="line">    timer = <span class="built_in">setInterval</span>(autoMove, <span class="number">2000</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 5.实现焦点跟随，显示哪一张图片，就给对应的焦点li加上类名active</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">changeFocus</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">    <span class="comment">// 循环所有的焦点，判断一下当前的step和哪个焦点的索引相等，和谁相等就给谁加上active类名，其余的清除active类名</span></span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; lis.length; i++) &#123;</span><br><span class="line">        <span class="keyword">if</span> (i == step) &#123;</span><br><span class="line">            lis[i].classList.add(<span class="string">&quot;active&quot;</span>);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            lis[i].classList.remove(<span class="string">&quot;active&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// 如果当前的step是data.length，说明当前页面显示的是最后一张图片，它和第一张图公用一个焦点，这时让第一个焦点高亮即可</span></span><br><span class="line">    <span class="keyword">if</span> (step == data.length) &#123;</span><br><span class="line">        lis[<span class="number">0</span>].classList.add(<span class="string">&quot;active&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">changeFocus();</span><br><span class="line"></span><br><span class="line"><span class="comment">// 6.点击分页器（小圆点），实现切换对应图片</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">bindClick</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; lis.length; i++) &#123;</span><br><span class="line">        lis[i].onclick = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">            autoMove(i);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">bindClick();</span><br><span class="line"></span><br><span class="line"><span class="comment">// 7.控制前进/后退按钮</span></span><br><span class="line">right.onclick = debounce(autoMove, <span class="number">300</span>);</span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">lClick</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (step == <span class="number">0</span>) &#123;</span><br><span class="line">        step = data.length;</span><br><span class="line">        wrapper.style.left = (data.length) * -<span class="number">1226</span> + <span class="string">&quot;px&quot;</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    step--;</span><br><span class="line">    autoMove(step)</span><br><span class="line">&#125;</span><br><span class="line">left.onclick = debounce(lClick, <span class="number">300</span>)</span><br><span class="line"></span><br><span class="line"><span class="comment">// 8.防抖</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">debounce</span>(<span class="params">fn, wait</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> timers = <span class="literal">null</span>;</span><br><span class="line">    <span class="keyword">let</span> result = <span class="literal">null</span>;</span><br><span class="line">    <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> (<span class="params">...args</span>) </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (timers) <span class="built_in">clearTimeout</span>(timers);</span><br><span class="line">        timers = <span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">            result = fn.apply(<span class="built_in">this</span>, ...args);</span><br><span class="line">        &#125;, wait)</span><br><span class="line">        <span class="keyword">return</span> result;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="jQuery版本"><a href="#jQuery版本" class="headerlink" title="jQuery版本"></a>jQuery版本</h3><ul>
<li>只需替换JS部分即可</li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">&quot;https://libs.baidu.com/jquery/1.11.3/jquery.min.js&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript">    <span class="keyword">let</span> timer = <span class="literal">null</span>;</span></span><br><span class="line"><span class="javascript">    <span class="keyword">let</span> url = <span class="string">&quot;./banner.json&quot;</span>;</span></span><br><span class="line"><span class="javascript">    <span class="keyword">let</span> step = <span class="number">0</span>;</span></span><br><span class="line"><span class="javascript">    <span class="keyword">let</span> lens = <span class="number">0</span>;</span></span><br><span class="line"><span class="javascript">    <span class="comment">// 1.数据请求</span></span></span><br><span class="line"><span class="javascript">    $.ajax(&#123;</span></span><br><span class="line">        url: url,</span><br><span class="line"><span class="javascript">        <span class="keyword">async</span>: <span class="literal">false</span>,</span></span><br><span class="line"><span class="javascript">        success: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span></span><br><span class="line">            bindHtml(res);</span><br><span class="line">            lens = res.length;</span><br><span class="line"><span class="javascript">            timer = <span class="built_in">setInterval</span>(autoMove, <span class="number">2000</span>);</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;)</span><br><span class="line"><span class="javascript">    <span class="comment">// 2.渲染图片</span></span></span><br><span class="line"><span class="javascript">    <span class="function"><span class="keyword">function</span> <span class="title">bindHtml</span>(<span class="params">data</span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">        <span class="keyword">let</span> imgs = <span class="string">&quot;&quot;</span>;</span></span><br><span class="line"><span class="javascript">        <span class="keyword">let</span> lis = <span class="string">&quot;&quot;</span>;</span></span><br><span class="line"><span class="javascript">        $.each(data, <span class="function">(<span class="params">index, item</span>) =&gt;</span> &#123;</span></span><br><span class="line"><span class="handlebars"><span class="xml">            imgs += `<span class="tag">&lt;<span class="name">li</span>&gt;</span><span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">&quot;$&#123;item.img&#125;&quot;</span> <span class="attr">alt</span>=<span class="string">&quot;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">li</span>&gt;</span>`;</span></span></span><br><span class="line"><span class="handlebars"><span class="xml">            lis += &quot;<span class="tag">&lt;<span class="name">li</span>&gt;</span><span class="tag">&lt;/<span class="name">li</span>&gt;</span>&quot;;</span></span></span><br><span class="line">        &#125;);</span><br><span class="line"><span class="handlebars"><span class="xml">        imgs += `<span class="tag">&lt;<span class="name">li</span>&gt;</span><span class="tag">&lt;<span class="name">img</span> <span class="attr">src</span>=<span class="string">&quot;$&#123;data[0].img&#125;&quot;</span> <span class="attr">alt</span>=<span class="string">&quot;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">li</span>&gt;</span>`;</span></span></span><br><span class="line"><span class="javascript">        $(<span class="string">&quot;#wrapper&quot;</span>).html(imgs);</span></span><br><span class="line"><span class="javascript">        $(<span class="string">&quot;#list&quot;</span>).html(lis);</span></span><br><span class="line">    &#125;</span><br><span class="line"><span class="javascript">    <span class="comment">// 3.实现自动轮播，每隔1000ms执行一次</span></span></span><br><span class="line"><span class="javascript">    <span class="function"><span class="keyword">function</span> <span class="title">autoMove</span>(<span class="params">index</span>) </span>&#123;</span></span><br><span class="line">        step++;</span><br><span class="line"><span class="javascript">        <span class="keyword">typeof</span> index == <span class="string">&quot;undefined&quot;</span> ? <span class="literal">null</span> : step = index;</span></span><br><span class="line"><span class="javascript">        <span class="keyword">if</span> (step &gt;= <span class="number">5</span>) &#123;</span></span><br><span class="line">            step = 1;</span><br><span class="line"><span class="javascript">            $(<span class="string">&quot;#wrapper&quot;</span>).animate(&#123;</span></span><br><span class="line"><span class="javascript">                left: <span class="string">&quot;0px&quot;</span></span></span><br><span class="line">            &#125;, 0)</span><br><span class="line">        &#125;</span><br><span class="line"><span class="javascript">        $(<span class="string">&quot;#wrapper&quot;</span>).animate(&#123;</span></span><br><span class="line"><span class="javascript">            left: -$(<span class="string">&quot;#outer&quot;</span>).width() * step + <span class="string">&quot;px&quot;</span>,</span></span><br><span class="line">        &#125;, 1000)</span><br><span class="line">        changeFocus();</span><br><span class="line">    &#125;</span><br><span class="line"><span class="javascript">    <span class="comment">// 4.鼠标划上图片停止轮播 鼠标离开继续轮播</span></span></span><br><span class="line"><span class="javascript">    $(<span class="string">&quot;#outer&quot;</span>).hover(<span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="javascript">        <span class="built_in">clearInterval</span>(timer);</span></span><br><span class="line"><span class="javascript">    &#125;, <span class="function">() =&gt;</span> &#123;</span></span><br><span class="line"><span class="javascript">        timer = <span class="built_in">setInterval</span>(autoMove, <span class="number">2000</span>);</span></span><br><span class="line">    &#125;)</span><br><span class="line"><span class="javascript">    <span class="comment">// 5.实现焦点跟随，显示哪一张图片，就给对应的焦点li加上类名active</span></span></span><br><span class="line"><span class="javascript">    <span class="function"><span class="keyword">function</span> <span class="title">changeFocus</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">        $(<span class="string">&quot;#list li&quot;</span>).eq(step).addClass(<span class="string">&quot;active&quot;</span>).siblings().removeClass(<span class="string">&quot;active&quot;</span>);</span></span><br><span class="line"><span class="javascript">        <span class="keyword">if</span> (step == lens) &#123;</span></span><br><span class="line"><span class="javascript">            $(<span class="string">&quot;#list li&quot;</span>).eq(<span class="number">0</span>).addClass(<span class="string">&quot;active&quot;</span>).siblings().removeClass(<span class="string">&quot;active&quot;</span>);</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    changeFocus();</span><br><span class="line"><span class="javascript">    <span class="comment">// 6.点击焦点，实现切换对应图片</span></span></span><br><span class="line"><span class="javascript">    <span class="function"><span class="keyword">function</span> <span class="title">bindClick</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">        $(<span class="string">&quot;#list li&quot;</span>).click(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            autoMove($(<span class="built_in">this</span>).index());</span></span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;</span><br><span class="line">    bindClick();</span><br><span class="line"><span class="javascript">    <span class="comment">// 7.控制箭头</span></span></span><br><span class="line"><span class="javascript">    $(<span class="string">&quot;#right&quot;</span>).click(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span></span><br><span class="line">        autoMove();</span><br><span class="line">    &#125;)</span><br><span class="line"><span class="javascript">    $(<span class="string">&quot;#left&quot;</span>).click(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">        <span class="keyword">if</span> (step == <span class="number">0</span>) &#123;</span></span><br><span class="line">            step = lens;</span><br><span class="line"><span class="javascript">            $(<span class="string">&quot;#wrapper&quot;</span>).animate(&#123;</span></span><br><span class="line"><span class="javascript">                left: lens * -<span class="number">800</span> + <span class="string">&quot;px&quot;</span></span></span><br><span class="line">            &#125;, 0)</span><br><span class="line">        &#125;</span><br><span class="line">        step--;</span><br><span class="line">        autoMove(step);</span><br><span class="line">    &#125;)</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>


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